164335021 has 2 divisors, whose sum is σ = 164335022. Its totient is φ = 164335020.

The previous prime is 164334997. The next prime is 164335027. The reversal of 164335021 is 120533461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94361796 + 69973225 = 9714^2 + 8365^2 .

It is a cyclic number.

It is not a de Polignac number, because 164335021 - 2²¹ = 162237869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164335027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82167510 + 82167511.

It is an arithmetic number, because the mean of its divisors is an integer number (82167511).

Almost surely, 2^164335021 is an apocalyptic number.

It is an amenable number.

164335021 is a deficient number, since it is larger than the sum of its proper divisors (1).

164335021 is an equidigital number, since it uses as much as digits as its factorization.

164335021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 164335021 is about 12819.3221739685. The cubic root of 164335021 is about 547.7428386969.

Adding to 164335021 its reverse (120533461), we get a palindrome (284868482).

The spelling of 164335021 in words is "one hundred sixty-four million, three hundred thirty-five thousand, twenty-one".